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<head>
  <meta charset="UTF-8">
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  <title>Document</title>
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<body>
  <nav class="navbar navbar-expand-md navbar-dark bg-dark">
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        <ul class="navbar-nav me-auto">
          <li class="nav-item">
            <a class="nav-link" href="#example">文档</a>
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            <a class="nav-link" href="#news">视频教程</a>
          </li>
          <li class="nav-item">
            <a class="nav-link" href="#technology">演练场</a>
          </li>
          <li class="nav-item dropdown">
            <a class="nav-link dropdown-toggle" data-bs-toggle="dropdown">
              生态系统
            </a>
            <ul class="dropdown-menu">
              <li class="dropdown-header">资源</li>
              <li><a class="dropdown-item" href="#">合作伙伴</a></li>
              <li><a class="dropdown-item" href="#">主题</a></li>
              <li class="dropdown-divider"></li>
              <li class="dropdown-header">帮助</li>
              <li><a class="dropdown-item" href="#">版本发布</a></li>
              <li><a class="dropdown-item" href="#">社区指南</a></li>
              <li><a class="dropdown-item disabled" href="#">行为规范</a></li>
            </ul>
          </li>
        </ul>
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          <li class="nav-item">
            <a class="nav-link" href="#login">登录</a>
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